It's easy!
You just have to make a recipe with dulce de leche, blog about it on October 11, with a link to this blog.
If you want to participate in the blogroll, you have to leave a comment in the entry posted that day here. The blogroll will be up at the end of October.
It's also required that during the month of September you have the badge of the event posted in your blog, with a link back here.
If you don't have a blog, you can participate by sending an email with your recipe and photo, and you will be included in the blogroll.
That's it!